package web.add;

import com.fasterxml.jackson.databind.ObjectMapper;
import domain.Book;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import service.BookService;
import service.UserService;
import service.impl.BookServiceImpl;
import service.impl.UserServiceImpl;
import util.ServletUtil;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;

@WebServlet("/addBook")
public class AddBookServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    // 上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "cover";

    // 上传配置
    private static final int MEMORY_THRESHOLD   = 1024 * 1024 * 3;  // 3MB
    private static final int MAX_FILE_SIZE      = 1024 * 1024 * 40; // 40MB
    private static final int MAX_REQUEST_SIZE   = 1024 * 1024 * 50; // 50MB
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String name="";
        String brief ="";
        String cover="";
        String fileName;
        String suffix="";
        ObjectMapper om = new ObjectMapper();
        Map<String,Object> msg = new HashMap<>();
        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();
        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(MEMORY_THRESHOLD);
        // 设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

        ServletFileUpload upload = new ServletFileUpload(factory);

        // 设置最大文件上传值
        upload.setFileSizeMax(MAX_FILE_SIZE);

        // 设置最大请求值 (包含文件和表单数据)
        upload.setSizeMax(MAX_REQUEST_SIZE);

        // 中文处理
        upload.setHeaderEncoding("UTF-8");

        // 构造临时路径来存储上传的文件
        // 这个路径相对当前应用的目录
        String uploadPath = request.getServletContext().getRealPath("./") + File.separator + UPLOAD_DIRECTORY;


        // 如果目录不存在则创建
        File uploadDir = new File(uploadPath);
        if (!uploadDir.exists()) {
            uploadDir.mkdir();
        }

        try {
            // 解析请求的内容提取文件数据
            List<FileItem> formItems = upload.parseRequest(request);
            if (formItems != null && formItems.size() > 0) {
                // 迭代表单数据
                for (FileItem item : formItems) {
                    // 处理不在表单中的字段
                    if (!item.isFormField()) {
                        fileName = new File(item.getName()).getName();
                        suffix = fileName.substring(fileName.lastIndexOf(".") + 1);
                        cover =""+UUID.randomUUID();
                        String filePath = uploadPath + File.separator +cover +"."+suffix;
                        File storeFile = new File(filePath);
                        // 在控制台输出文件的上传路径
                        System.out.println(filePath);
                        // 保存文件到硬盘
                        item.write(storeFile);
                        request.setAttribute("message",
                                "文件上传成功!");
                    }
                    switch (item.getFieldName()){
                        case "name":
                            name=item.getString();
                            break;
                        case "brief":
                            brief=item.getString();
                            break;
                        default:
                    }
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
            request.setAttribute("message",
                    "错误信息: " + ex.getMessage());
        }
        BookService bs = new BookServiceImpl();
        System.out.println(name+":"+brief);
        if(brief==null){
            brief="";
        }
//        int bid, int uid, String cover, String name, String brief, Date createionTime
        if(name==null ||"".equals(name)){
            //传参数错误
            msg.put("success",false);
            om.writeValue(response.getOutputStream(),msg);
        }else {
            bs.creatBook(new Book(-1,ServletUtil.checkLogin(request).getUid(),cover +"."+suffix,name,brief,new Date()));
            msg.put("success",true);
            om.writeValue(response.getOutputStream(),msg);
        }
    }
}

